WeaponMirv.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    Scorched3D is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <weapons/WeaponMirv.h>
#include <weapons/AccessoryStore.h>
#include <engine/ActionController.h>
#include <common/Defines.h>

REGISTER_ACCESSORY_SOURCE(WeaponMirv);

WeaponMirv::WeaponMirv() :
        noWarheads_(0), hspreadDist_(0), vspreadDist_(0)
{

}

WeaponMirv::~WeaponMirv()
{

}

bool WeaponMirv::parseXML(AccessoryCreateContext &context, XMLNode *accessoryNode)
{
        if (!Weapon::parseXML(context, accessoryNode)) return false;

        // Get the accessory spread
        if (!accessoryNode->getNamedChild("hspreaddist", hspreadDist_)) 
                return false;
        if (!accessoryNode->getNamedChild("vspreaddist", vspreadDist_)) 
                return false;

        // Get the next weapon
        XMLNode *subNode = 0;
        if (!accessoryNode->getNamedChild("aimedweapon", subNode)) return false;

        // Check next weapon is correct type
        AccessoryPart *accessory = context.getAccessoryStore().
                createAccessoryPart(context, parent_, subNode);
        if (!accessory || accessory->getType() != AccessoryPart::AccessoryWeapon)
        {
                return subNode->returnError("Failed to find sub weapon, not a weapon");
        }
        aimedWeapon_ = (Weapon*) accessory;

        // Get the accessory warheads
        if (!accessoryNode->getNamedChild("nowarheads", noWarheads_)) return false;

        return true;
}

void WeaponMirv::fireWeapon(ScorchedContext &context,
        WeaponFireContext &weaponContext, FixedVector &position, FixedVector &velocity)
{
        // Add a shot that will fall where the original was aimed
        aimedWeapon_->fireWeapon(context, weaponContext, position, velocity);

        RandomGenerator &random = context.getActionController().getRandom();

        // Add all of the sub warheads that have a random spread
        fixed hspreadDist;
        for (int i=0; i<noWarheads_ - 1; i++)
        {
                FixedVector newDiff = velocity;
                newDiff[2] = 0;
                // Ensure the same value is used in all parts of the calc
                hspreadDist = hspreadDist_.getValue(context);
                if (hspreadDist != 0)
                {
                        FixedVector diff = newDiff;
                        diff[2] -= 1;
                        FixedVector perp = newDiff * diff;

                        newDiff += (perp * ((random.getRandFixed() * hspreadDist) - (hspreadDist * fixed(true, 5000))));
                }
                newDiff[2] += (fixed(i - (noWarheads_ / 2)) / 
                        fixed(noWarheads_ / 2)) * vspreadDist_.getValue(context);

                aimedWeapon_->fireWeapon(context, weaponContext, position, newDiff);
        }
}

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